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Mortgage Servicing - Summary of Delinquency Status of Loans Underlying Mortgage Servicing Rights (Details)
Mar. 31, 2023
Dec. 31, 2022
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 10.00% 11.10%
30 days    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 4.10% 4.80%
60 days    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 1.60% 1.80%
90 days or more    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 4.30% 4.50%
Fair Value Agency Mortgage Servicing Rights    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 2.80% 3.30%
Fair Value Agency Mortgage Servicing Rights | 30 days    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 1.40% 1.70%
Fair Value Agency Mortgage Servicing Rights | 60 days    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 0.40% 0.50%
Fair Value Agency Mortgage Servicing Rights | 90 days or more    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 1.00% 1.10%
Fair Value Non-Agency Mortgage Servicing Rights    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 18.90% 20.40%
Fair Value Non-Agency Mortgage Servicing Rights | 30 days    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 7.50% 8.50%
Fair Value Non-Agency Mortgage Servicing Rights | 60 days    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 3.00% 3.30%
Fair Value Non-Agency Mortgage Servicing Rights | 90 days or more    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 8.40% 8.60%